Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33554
標題: 關刀溪森林集水區逕流特性之研究
Study on the Characteristics of Runoff for the Guandaushi Forest Watershed
作者: 許文銓
Sheu, Wen-Chyuan
關鍵字: Guandaushi Watershed;關刀溪集水區;Characteristics of Runoff;Unit Hydrograph;逕流特性;單位歷線
出版社: 水土保持學類
摘要: 
本研究之目的乃以單位歷線理論為基礎﹐應用Nash之瞬時單位歷線法與無
因次單位歷線法﹐分析關刀溪森林集水區之逕流特性﹐以瞭解該集水區降
雨與逕流之關係。而由分析過程與結果所得之結論如下:1.在集水區入滲
能力未知之條件下,對於逕流分析時基流之分離,以退水常數法較適合。
若僅針對暴雨強度遠大於集水區入滲能力之暴雨進行分析,則以固定基流
上升率之方法較為簡單而易於分析。2.由於臨前基流量大小對逕流模擬之
結果影響甚大﹐因此土壤水分含量應為影響本集水區逕流特性之重要因素
﹐而臨前基流量較大與降雨強度較大時﹐應用單位歷線理論分析逕流特性
應屬適用﹐然確實之適用條件仍有待研究。3.本集水區暴雨逕流之退水甚
為平緩﹐而以兩組Gamma分佈函數組合之瞬時單位歷線修正Nash之瞬時單
位歷線可反映此逕流特性。4.本集水區之逕流機制以地表下流出之暴雨逕
流與飽和地表逕流較為可能,其確切之機制則尚待研究。5.本集水區基流
上升量與降雨成正相關﹐且平均逕流係數甚低﹐顯示本集水區具良好之水
源涵養功能。

The purpose of this study is to know the relation between rain
and runoff for a small watershed in the Guandaushi Basin by
applying Nash''s instantaneous unit hydrograph and dimensionless
unit hydrograph to analyze the characteristics of runoff in this
watershed based on the unit hydrograph theorem. The results are
summarized as follows:1. When the infiltration rate of the
watershed was unknown, the recession constant method was more
suitable for baseflow separation. When the rainfall intensity
was greatly higher than the infiltration rate, the method of
fixing the rising slope of baseflow should be easier to
analyze.2. Because the antecedent baseflow affected greatly the
result of fitting, soil water content seemed to be an important
factor affecting the characteristics of runoff for this
watershed. The unit hydrograph theorem would be suitable with
the high antecedent baseflow and the high rainfall intensity.3.
The recession of stormflow in this watershed was very low, and
using the instantaneous unit hydrograph combined with two gamma
distribution functions instead of the Nash''s instantaneous unit
hydrograph appeared to reflect this characteristics .4. The type
of runoff in this watershed may be the subsurface stormflow or
the saturation overland flow.5. The increase of baseflow is
positively relation to rainfall amount in this watershed, and
the average runoff coefficient of this watershed is very low.
Therefore, the capability of water conservation in this
watershed seems very high.
URI: http://hdl.handle.net/11455/33554
Appears in Collections:水土保持學系

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